Photoshop is running slowly on my system, and I don't know why

You guys have taken a great thing Photoshop and made it into the biggest crap software I have ever seen, I just downloaded the newest version for my brand new 8 core Pentium I7 computer. The software crashes periodically and bogs my system down like no other program on my computer. I used to use photoshop as a powerhorse and it wa sreliable, stable and trouble free. How can I get back to those days??? You guys took a great thing, added way too many features, changed the way basic functionalities worked that were intuitive and self explanitory and made this into a complicated memory and processor intensive piece of crap software. This sucks big time for me and my company. How do I get an old verison again , please send me back tot he days of phtooshop 6 and help